Laser detection system and method for concentration of harmful gas in atmosphere of open space

A laser detection and harmful gas technology, applied in the field of environmental optics, can solve the problems of complex atmospheric turbulence and detection errors

Active Publication Date: 2018-03-06
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

However, in the actual application of the development of the instrument system, the influence of atmospheric turbulence is more complicated, which may easily cause detection errors
To reduce the influence of atmospheric turbulence through a high scanning frequency, the bandwidth of the laser control module is limited, so the high-frequency scanning method is limited in the development of the instrument system; increasing the receiving aperture reduces the loss of light intensity in a certain sense, but It does not fundamentally address the influence of atmospheric turbulence on spectral signals

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  • Laser detection system and method for concentration of harmful gas in atmosphere of open space
  • Laser detection system and method for concentration of harmful gas in atmosphere of open space
  • Laser detection system and method for concentration of harmful gas in atmosphere of open space

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[0051] The specific implementation of this patent will be described in detail below with reference to the accompanying drawings. The specific implementations described here are only used to illustrate and explain the patent, and are not used to limit the patent.

[0052] See figure 1 , A laser detection system for the concentration of harmful gases in the open space atmosphere, including: a same-frequency dual-wave laser signal generation unit, a signal acquisition and processing unit, a display unit 2, a detection light path and a reference light path;

[0053] The laser generated by the same frequency dual-wave laser signal generating unit is divided into two lasers. One laser is converted into an electrical signal by the detection optical path and transmitted to the signal acquisition processing unit, and the other laser is converted into another electrical signal by the reference optical path and transmitted to the signal. In the acquisition and processing unit, both electrical...

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Abstract

The invention discloses a laser detection system and method for concentration of harmful gas in an atmosphere of an open space. The laser detection system comprises a same-frequency dual-wave laser signal generation unit, a signal acquisition and processing unit, a display unit, a detection optical path and a reference optical path. By virtue of the steps of correcting the movement of center wavelength of a distribution feedback-type semiconductor laser, correcting flash noise, fitting complete non-absorptive spectral signal, normalizing, performing Voigt linear fitting, calculating the concentration, performing the inversion, and the like, the problems such as atmospheric extinction, laser flashing and wavelength drifting can be prevented, so that the real-time precision detection of thegas concentration can be realized.

Description

Technical field [0001] The invention relates to the field of environmental optics, in particular to a system and method for suppressing atmospheric turbulence noise by means of multi-wavelength time-domain correlation technology, and detecting gas concentration by laser spectrum. Background technique [0002] In the process of monitoring the open space atmosphere, the concentration of the detected gas is relatively low, but it is affected by the uncontrollable environment such as atmospheric turbulence and temperature, which causes the problem that useful signals and noise are difficult to extract. Atmospheric turbulence mainly causes the laser's scintillation effect caused by the change of the refractive index of the atmospheric molecular clusters to cause the beam to produce intensity fluctuations, phase fluctuations, beam expansion, beam drift, and image point jitter, resulting in linear deformation of the gas absorption spectrum. [0003] The existing reduction in the influence...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/01
CPCG01N21/01G01N21/31G01N2021/0106G01N2201/06G01N2201/061
Inventor 张玉钧唐七星何莹尤坤刘国华鲁一冰范博强张恺余冬琪李潇毅刘建国刘文清
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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